Why not put one of the MD600 Discs into the TwinStore alongside a blank disc, this would force a rebuild of the Raid / Mirror.

Data Transfer across the SATA interface will be substantially quicker than across even Gigabit Ethernet and the File "conversion" that is part of the Restore process also becomes unnecessary, resulting in even further time savings.

In addition, deleted Albums would not be restored and Playlists would also be maintained.

-